Geology
The entire part of Serbia east of the Great and South Morava rivers is referred to as "Carpatho-Balkan arc" in geotectonic terminology. The region is composed of rocks of Proterozoic to Quaternary age. Limestones and dolomites (in a lesser extent) of Jurassic (J2, J3) and Lower Cretaceous (K1+2, K3+4) age whose thickness can be more than 1,000 m. The structures are generally oriented in north-south direction, which bend on northern and southern parts, forming a C-shaped arc.
Though those mountains are related to the Carpathians from the geological point of view, they have been included to them by the scientists only at the end of the 20. century. In the past, those mountains were included by mistake to the Balkan mountains.
Read more about this topic: Serbian Carpathians